Question

Which kind of change is separation of napthelene from a mixture of napthelene & sodium chloride chemical or physical
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Answer 1

Answer:

The mixture of naphthalene and sodium chloride can be separated by the process of sublimation as naphthalene is a sublime, i.e. it turns into vapour without changing in liquid and its vapour change into solid without changing into liquid, while sodium chloride is not a sublime.

Explanation:

I will also suggest you a activity

Materials required: China glass, funnel, tripod, gas burner, spatula, cotton.

Process:

Take the mixture in a china glass.

Put it on the tripod.

Cover the mixture with a funnel by putting it inverted on the china glass.

Plug the tip of the funnel using some cotton.

Now start heating the china glass containing mixture.

Stop heating after 30 to 60 second when vapour starts rising in the funnel.

Leave the apparatus to get cooled.

You will observe that naphthalene gets deposited on the inner wall of the funnel because of sublimation leaving the sodium chloride in the china glass.

Scratch out the naphthalene deposited on the inner wall of the funnel.

exemplar problem and solution class nine matter 9

Using this process the mixture of naphthalene and sodium chloride can be separated.

Answer 2

Answer:

Sublimation

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